watchdog: at91sam9_wdt: fix secs_to_ticks

Fix the secs_to_ticks macro in case 0 is passed as an argument.

Signed-off-by: Boris BREZILLON <b.brezillon@overkiz.com>
Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Wim Van Sebroeck <wim@iguana.be>

diff --git a/drivers/watchdog/at91sam9_wdt.c b/drivers/watchdog/at91sam9_wdt.c
index 9bd089e..65f4691 100644 (file)
--- a/drivers/watchdog/at91sam9_wdt.c
+++ b/drivers/watchdog/at91sam9_wdt.c
@@ -51,7 +51,7 @@
 #define ticks_to_hz_rounddown(t)       ((((t) + 1) * HZ) >> 8)
 #define ticks_to_hz_roundup(t)         (((((t) + 1) * HZ) + 255) >> 8)
 #define ticks_to_secs(t)               (((t) + 1) >> 8)
-#define secs_to_ticks(s)               (((s) << 8) - 1)
+#define secs_to_ticks(s)               ((s) ? (((s) << 8) - 1) : 0)
 
 #define WDT_MR_RESET   0x3FFF2FFF